My 8 year old DSS (resident with DH and I has good contact with his DM) is slowly but surely driving me insane with his constant refrain of "I don't know". No matter how simple or complex the question is, his first and automatic reply is "I don't know". Example - me:"how did you get on a school today?" him "I don't know". Normally I just let it go but if he's being bold i.e. fighting with his little brothers or not doing as he's told and I try and find out what's gone on he will literally stand for the whole time I'm trying to speak to him saying "I don't know", he doesn't know what has happened or what he did or why he did it! Please tell me this is normal and passing phase and that (hopefully) sooner rather than later we may be able to have a normal conversation again!!!!